Niche specificity and potential terrestrial organic carbon utilization of benthic Bathyarchaeota in a eutrophic subtropic estuarine system
Niche specificity and potential terrestrial organic carbon utilization of benthic Bathyarchaeota in a eutrophic subtropic estuarine system
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富营养化亚热带河口系统底栖深古菌的生态位特异性和潜在的陆地有机碳利用
DOI：
10.1016/j.chemgeo.2020.119839
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发表时间：
2020-08
期刊：
影响因子：
3.9
通讯作者：
Zhang Chuanlun
中科院分区：
文献类型：
--
作者：
Wang Peng;Zhang Tingting;Chen Songze;Li Xinxin;Lai Dengxun;Gao Simin;Xie Wei;Zhang Chuanlun
河口是连接陆地和海洋的重要纽带。河口异养微生物是由河流输送的顽固性陆地有机碳(OC)和水生光营养物质产生的不稳定有机碳组成的复合库。底栖生物广泛分布于河口沉积物中，具有独特的碳代谢功能。然而，对它们的生态和生理能力还没有完全了解。本研究结合珠江口沉积物的分类组成和综合的地球化学资料，研究了珠江口沉积物中沉积物的分布和有机碳的利用潜力。Bathy-6、Bathy-8、Bathy-15和Bathy-17亚群在所有沉积物样品中占主导地位。不同的深海考古亚群在前沉积物盐度梯度上占有不同的生态位。淡水沉积物中深海古细菌亚群的季节变化与氨氮呈显著正相关。Bathy-8等底栖生物的丰度与δ13C和陆源有机碳含量显著相关。这些结果表明，Bathya chae对前沉积物中顽固的陆源有机碳的利用可能在动态亚热带河口系统的有机碳周转中起着重要作用。
Estuaries represent an important link between the land and the ocean. Heterotrophic microorganisms in the estuary are fuelled by a composite pool of both recalcitrant terrestrial organic carbon (OC) transported by rivers and labile OC produced by aquatic phototrophs.Bathyarchaeota thatare widely distributed in estuarine sediments have unique metabolic functions in carbon metabolism. However, their ecology and physiological capacities are not fully understood. In this study, we coupled taxonomic composition with comprehensive geochemical data to investigate the distribution and the OC utilization potential ofBathyarchaeotain the sediment of Pearl River Estuary (PRE). The subgroups of Bathy-6, Bathy-8, Bathy-15 and Bathy-17 dominated in all sediment samples. Different bathyarchaeotal subgroups occupied different niches along the salinity gradient in the PRE sediment. Seasonal variations of bathyarchaeotal subgroups presented in freshwater sediments are significantly positively correlated with ammonium. The abundance ofBathyarchaeota, such as Bathy-8, was significantly correlated with δ13C and fraction of terrestrially derived OC. These results indicated thatBathyarchaeotapotentially utilized recalcitrant terrestrial OC in PRE sediments and may play an important role in the OC turnover in dynamic subtropical estuarine systems.
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